From left: Jerry Speyer, Rob Speyer, Bill Rudin, Peter Malkin and Anthony Malkin Seymour Durst and his brothers built six Manhattan buildings in a 12-year run. Paul and Seymour Milstein built 10 in about the same amount of time. And Lew and Jack Rudin built 11 in two decades. The breakneck pace of development — which was largely clustered in the 1960s and the 1980s — by those three families, and a slew of others, laid the foundation for many of New York City’s most established real estate dynasties. (Think Tishman, Fisher, Malkin, Resnick, LeFrak, Rose, and Zeckendorf.) Indeed, after pa...